1    /KEEP

  Syntax:

      /KEEP=n

  You use /KEEP=n to specify the number of versions of each object  you
  want  to keep.  The number must be greater than zero.  The default is
  /KEEP=1.

2    /LOG

  Syntax:

      /LOG [=file-specification]
      /NOLOG

  You use /LOG  if  you  want  DMU  to  generate  a  message  for  each
  dictionary  object  deleted  by  the  PURGE  command.   If you do not
  specify a file, the messages are sent to the terminal.   The  default
  is /NOLOG.